2-90.frieda friendly works for a local car dealership. she noticed that of the cars are sedans and that half of them are white. what fraction of the dealership's cars are white sedans? homework ✎use a unit rectangle to represent this situation. label the parts carefully. write an equation or a sentence that describes the situation, and answer the question. write your answer from part (b) as a decimal and as a percent.

d

step-by-step explanation:

d

70,000 + 6,000 + 800 + 30

step-by-step explanation:

42

step-by-step explanation:

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240